US7042682B2 - Fully shielded perpendicular recoding writer - Google Patents
Fully shielded perpendicular recoding writer Download PDFInfo
- Publication number
- US7042682B2 US7042682B2 US10/688,046 US68804603A US7042682B2 US 7042682 B2 US7042682 B2 US 7042682B2 US 68804603 A US68804603 A US 68804603A US 7042682 B2 US7042682 B2 US 7042682B2
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- US
- United States
- Prior art keywords
- shield
- write pole
- downstream
- upstream
- side shields
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/10—Structure or manufacture of housings or shields for heads
- G11B5/11—Shielding of head against electric or magnetic fields
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3143—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
- G11B5/3146—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3143—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
- G11B5/3146—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
- G11B5/315—Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads
Abstract
Description
The invention relates to the general field of magnetic disk systems with particular reference to magnetic write heads for perpendicular designs, more specifically to flux leakage from the write pole.
Perpendicular magnetic recording (PMR) is important for the future of the magnetic recording industry because it offers higher areal density than the current longitudinal magnetic recording (LMR). This is due to the fact that the P medium is thermally more stable than that used for LMR. At present, LMR has achieved over 100 Gigabits per square inch (Gbpsi) in the laboratory and more than 60 Gpsi in products currently offered at the market place. In order to further extend the LMR recording density, two main obstacles have to be overcome. The first one is the thermal stability of the LMR recording media which arises because its thickness has to decrease to the extent that thermal energy could randomize the recorded bits. The second one is the ongoing increase in the write field needed to record on the high coercivity LMR media.
This high coercivity is needed to achieve high bit resolution and good thermal stability. Both obstacles to LMR could be considerably lowered if PMR were deployed instead. Thicker PMR media with a magnetically soft under-layer film (SUL), could be used to alleviate the thermal stability problem. A PMR writer provides a larger write field than that of LMR, which is limited to the fringe field from its write gap.
An example of a perpendicular writer of the prior art is shown in
One of the problems for a PMR writer of the type seen in
As shown in the attached simulation plots:—
A routine search of the prior art was performed with the following references of interest being found:
In U.S. Pat. No. 4,656,546 (Mallory) describe a downstream shield. In U.S. Pat. No. 5,003,423, Imamura et al disclose pole shields on the sides, upstream, and downstream. Das, in U.S. Pat. No. 5,075,956, shows a magnetic pole with side shields. Gill et al in U.S. Pat. No. 5,621,592 and also in U.S. Pat. No. 5,515,221, teach laminated shield layers.
It has been an object of at least one embodiment of the present invention to provide a magnetic writer suitable for vertical recording.
Another object of at least one embodiment of the present invention has been that said writer have minimal upstream and downstream flux leakage.
These objects have been achieved by adding upstream and side magnetic shields to the prior art structure and then connecting up and downstream shields by means of magnetic side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to full side shields.
In this invention, we disclose a perpendicular magnetic writer design with magnetic shields at both the leading and trailing edges of the write pole, together with side shields.
The invention has been realized in two embodiments. We start our description with the portion of these structures that is common to both of them:
Referring initially to
Referring now to
An important additional novel feature is illustrated in
The spacing between upstream shield 32 and write pole 13 is between about 0.1 and 1 microns while the spacing between downstream shield 15 and write pole 13 is between about 0.03 and 0.2 microns. Side shields 31 a and 31 b are located between about 0.05 and 0.2 microns from write pole 13 and they are between about 0.1 and 5 microns wide (along a direction normal to the plane of the figure). As a result, the bottom surfaces of the side shields will, in general, be coplanar with the write pole's bottom surface.
For the first embodiment, the upstream leakage outside said side shields is less than about 10% while the downstream leakage outside the side shields is less than about 10%. A detailed field plot of for the area immediately around the write pole can be seen in
This embodiment is the same in its appearance as the first embodiment when viewed in direction D i.e. as seen in
For the second embodiment, the upstream leakage outside the side shields is less than about 10% while the downstream leakage outside the side shields is less than about 10%. A detailed field plot for the area immediately around the write pole can be seen in
Claims (32)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/688,046 US7042682B2 (en) | 2003-10-17 | 2003-10-17 | Fully shielded perpendicular recoding writer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/688,046 US7042682B2 (en) | 2003-10-17 | 2003-10-17 | Fully shielded perpendicular recoding writer |
JP2004303433A JP2005122887A (en) | 2003-10-17 | 2004-10-18 | Method for suppressing magnetic flux leakage of vertical recording type magnetic head, and vertical recording type magnetic head |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050083605A1 US20050083605A1 (en) | 2005-04-21 |
US7042682B2 true US7042682B2 (en) | 2006-05-09 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/688,046 Active 2024-06-15 US7042682B2 (en) | 2003-10-17 | 2003-10-17 | Fully shielded perpendicular recoding writer |
Country Status (2)
Country | Link |
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US (1) | US7042682B2 (en) |
JP (1) | JP2005122887A (en) |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050128637A1 (en) * | 2003-12-16 | 2005-06-16 | Seagate Technology Llc | Head for perpendicular recording with reduced erasure |
US20060012914A1 (en) * | 2004-07-13 | 2006-01-19 | Sae Magnetics (H.K.) Ltd. | Thin film magnetic head, head gimbals assembly, head arm assembly, magnetic recording apparatus, and method of manufacturing thin film magnetic head |
US20060092575A1 (en) * | 2004-02-25 | 2006-05-04 | Hitachi Global Storage Technologies Netherlands, B.V. | Magnetic head and magnetic disk storage apparatus mounting the same |
US20060119984A1 (en) * | 2004-12-03 | 2006-06-08 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head with soft magnetic shield and magnetic storage |
US20060245109A1 (en) * | 2005-04-27 | 2006-11-02 | Hitachi Global Storage Technologies | Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset |
US20060245108A1 (en) * | 2005-04-27 | 2006-11-02 | Hitachi Global Storage Technologies | Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head |
US20080112081A1 (en) * | 2006-11-10 | 2008-05-15 | Sae Magnetics (H.K.) Ltd. | Perpendicular magnetic write head, method of manufacturing the same, and magnetic recording apparatus |
US20080222879A1 (en) * | 2007-03-16 | 2008-09-18 | Tdk Corporation | Method of manufacturing magnetic head and method of manufacturing magnetic head substructure |
US20080222878A1 (en) * | 2007-03-16 | 2008-09-18 | Tdk Corporation | Method of manufacturing magnetic head |
US20080247087A1 (en) * | 2007-04-06 | 2008-10-09 | Tdk Corporation | Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer |
US20080259498A1 (en) * | 2007-04-19 | 2008-10-23 | Hitachi Global Storage Technologies | Perpendicular write head with independent trailing shield designs |
US20090122449A1 (en) * | 2007-11-08 | 2009-05-14 | Samsung Electronics Co., Ltd. | Magnetic write head and method of manufacturing the same |
US20090152235A1 (en) * | 2007-12-13 | 2009-06-18 | Wen-Chien David Hsiao | Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control |
US20110007428A1 (en) * | 2009-07-13 | 2011-01-13 | Seagate Technology Llc | Write pole with a synthesized low magnetization shield |
US20110075299A1 (en) * | 2009-09-30 | 2011-03-31 | Olson Trevor W | Magnetic write heads for hard disk drives and method of forming same |
US20110075295A1 (en) * | 2009-09-30 | 2011-03-31 | Zhang Sue S | Slanted bump design for magnetic shields in perpendicular write heads and method of making same |
US20110076393A1 (en) * | 2009-09-30 | 2011-03-31 | Bonhote Christian R | Trailing plated step |
US20110097601A1 (en) * | 2009-10-26 | 2011-04-28 | Headway Technologies, Inc. | Wrap-around shielded writer with highly homogeneous shield material |
US20110135959A1 (en) * | 2009-12-09 | 2011-06-09 | Liubo Hong | Pmr writer and method of fabrication |
US20110134569A1 (en) * | 2009-12-09 | 2011-06-09 | Allen Donald G | Pmr writer and method of fabrication |
US20110135962A1 (en) * | 2009-12-09 | 2011-06-09 | Liubo Hong | Pmr writer and method of fabrication |
US20110134568A1 (en) * | 2009-12-09 | 2011-06-09 | Yingjian Chen | Pmr writer and method of fabrication |
US8000064B2 (en) | 2007-12-13 | 2011-08-16 | Tdk Corporation | Thin-film magnetic head for perpendicular magnetic recording and method of making the same |
US8015692B1 (en) | 2007-11-07 | 2011-09-13 | Western Digital (Fremont), Llc | Method for providing a perpendicular magnetic recording (PMR) head |
US8166632B1 (en) | 2008-03-28 | 2012-05-01 | Western Digital (Fremont), Llc | Method for providing a perpendicular magnetic recording (PMR) transducer |
US8166631B1 (en) | 2008-08-27 | 2012-05-01 | Western Digital (Fremont), Llc | Method for fabricating a magnetic recording transducer having side shields |
US8231796B1 (en) | 2008-12-09 | 2012-07-31 | Western Digital (Fremont), Llc | Method and system for providing a magnetic recording transducer having side shields |
US8276258B1 (en) | 2008-08-26 | 2012-10-02 | Western Digital (Fremont), Llc | Method for fabricating a magnetic recording transducer |
US8630153B1 (en) | 2012-11-05 | 2014-01-14 | Headway Technologies, Inc. | TAMR writer with a concave leading shield for enhanced field magnitude |
US8720044B1 (en) | 2008-09-26 | 2014-05-13 | Western Digital (Fremont), Llc | Method for manufacturing a magnetic recording transducer having side shields |
US8793866B1 (en) | 2007-12-19 | 2014-08-05 | Western Digital (Fremont), Llc | Method for providing a perpendicular magnetic recording head |
US8879207B1 (en) | 2011-12-20 | 2014-11-04 | Western Digital (Fremont), Llc | Method for providing a side shield for a magnetic recording transducer using an air bridge |
US8914969B1 (en) | 2012-12-17 | 2014-12-23 | Western Digital (Fremont), Llc | Method for providing a monolithic shield for a magnetic recording transducer |
US8980109B1 (en) | 2012-12-11 | 2015-03-17 | Western Digital (Fremont), Llc | Method for providing a magnetic recording transducer using a combined main pole and side shield CMP for a wraparound shield scheme |
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US7031121B2 (en) * | 2003-07-30 | 2006-04-18 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular recording magnetic head with a write shield magnetically coupled to a first pole piece |
JP4260002B2 (en) * | 2003-12-24 | 2009-04-30 | ヒタチグローバルストレージテクノロジーズネザーランドビーブイ | Magnetic head and its production method and a magnetic recording and reproducing apparatus |
JP2006252694A (en) * | 2005-03-11 | 2006-09-21 | Hitachi Global Storage Technologies Netherlands Bv | Magnetic head for vertical recording |
US7365942B2 (en) * | 2005-06-22 | 2008-04-29 | Headway Technologies, Inc. | Thin-film magnetic head |
KR100763904B1 (en) * | 2005-08-12 | 2007-10-05 | 삼성전자주식회사 | Perpendicular magnetic recording head and manufacturing methof for the same |
JP4499044B2 (en) * | 2006-01-04 | 2010-07-07 | ヒタチグローバルストレージテクノロジーズネザーランドビーブイ | The perpendicular magnetic recording medium and a magnetic storage apparatus using the same |
US7609479B2 (en) * | 2006-03-10 | 2009-10-27 | Headway Technologies, Inc. | Magnetic head for perpendicular magnetic recording and method of manufacturing same |
US7538976B2 (en) * | 2006-04-25 | 2009-05-26 | Hitachi Global Storage Technologies B.V. | Trailing shield design for reducing wide area track erasure (water) in a perpendicular recording system |
US7576951B2 (en) * | 2006-04-25 | 2009-08-18 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular magnetic write head having a magnetic write pole with a concave trailing edge |
JP4287457B2 (en) * | 2006-05-11 | 2009-07-01 | 株式会社東芝 | Perpendicular recording magnetic head and a magnetic disk drive |
US7715147B2 (en) * | 2006-10-27 | 2010-05-11 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic write head having a shield that extends below the leading edge of the write pole |
US20080112088A1 (en) * | 2006-11-13 | 2008-05-15 | Hitachi Global Storage Technologies | Perpendicular magnetic write head having a wrap around trailing shield with a flux return path |
US7889458B2 (en) * | 2006-11-13 | 2011-02-15 | Hitachi Global Storage Technologies Netherlands B.V. | Write head with self-cross biased pole for high speed magnetic recording |
US7467461B2 (en) * | 2007-03-20 | 2008-12-23 | Hitachi Global Storage Technologies Netherlands B.V. | Additive gap process to define trailing and side shield gap for a perpendicular write head |
US8102623B2 (en) * | 2007-08-31 | 2012-01-24 | Tdk Corporation | Thin-film magnetic head with a magnetic pole having an inclined step at its top end section surface, magnetic head assembly with the thin-film magnetic head, magnetic disk drive apparatus with the magnetic head assembly, and manufacturing method of thin-film magnetic head |
US8000059B2 (en) * | 2007-12-12 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular magnetic write head with a thin wrap around magnetic shield |
US8795763B2 (en) * | 2007-12-26 | 2014-08-05 | Headway Technologies, Inc. | Perpendicular magnetic medium with shields between tracks |
US8432639B2 (en) * | 2010-05-06 | 2013-04-30 | Headway Technologies, Inc. | PMR writer with π shaped shield |
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- 2004-10-18 JP JP2004303433A patent/JP2005122887A/en active Pending
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Cited By (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7233457B2 (en) * | 2003-12-16 | 2007-06-19 | Seagate Technology Llc | Head for perpendicular recording with reduced erasure |
US20050128637A1 (en) * | 2003-12-16 | 2005-06-16 | Seagate Technology Llc | Head for perpendicular recording with reduced erasure |
US20060092575A1 (en) * | 2004-02-25 | 2006-05-04 | Hitachi Global Storage Technologies Netherlands, B.V. | Magnetic head and magnetic disk storage apparatus mounting the same |
US7684149B2 (en) * | 2004-02-25 | 2010-03-23 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head and magnetic disk storage apparatus mounting the same |
US20060012914A1 (en) * | 2004-07-13 | 2006-01-19 | Sae Magnetics (H.K.) Ltd. | Thin film magnetic head, head gimbals assembly, head arm assembly, magnetic recording apparatus, and method of manufacturing thin film magnetic head |
US20060119984A1 (en) * | 2004-12-03 | 2006-06-08 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head with soft magnetic shield and magnetic storage |
US7450349B2 (en) * | 2004-12-03 | 2008-11-11 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head with soft magnetic shield and magnetic storage |
US20060245108A1 (en) * | 2005-04-27 | 2006-11-02 | Hitachi Global Storage Technologies | Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head |
US20060245109A1 (en) * | 2005-04-27 | 2006-11-02 | Hitachi Global Storage Technologies | Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset |
US7639450B2 (en) * | 2005-04-27 | 2009-12-29 | Hitachi Global Storage Technologies Netherlands B.V. | Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head |
US7551396B2 (en) * | 2005-04-27 | 2009-06-23 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset |
US20080112081A1 (en) * | 2006-11-10 | 2008-05-15 | Sae Magnetics (H.K.) Ltd. | Perpendicular magnetic write head, method of manufacturing the same, and magnetic recording apparatus |
US8400732B2 (en) * | 2006-11-10 | 2013-03-19 | Sae Magnetics (H.K.) Ltd. | Perpendicular magnetic write head, having side shields coupled to a leading shield and apart from a trailing shield |
US20080222878A1 (en) * | 2007-03-16 | 2008-09-18 | Tdk Corporation | Method of manufacturing magnetic head |
US20080222879A1 (en) * | 2007-03-16 | 2008-09-18 | Tdk Corporation | Method of manufacturing magnetic head and method of manufacturing magnetic head substructure |
US7832085B2 (en) | 2007-03-16 | 2010-11-16 | Tdk Corporation | Method of manufacturing magnetic head and method of manufacturing magnetic head substructure |
US7995308B2 (en) | 2007-04-06 | 2011-08-09 | Tdk Corporation | Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer |
US20080247087A1 (en) * | 2007-04-06 | 2008-10-09 | Tdk Corporation | Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer |
US20080259498A1 (en) * | 2007-04-19 | 2008-10-23 | Hitachi Global Storage Technologies | Perpendicular write head with independent trailing shield designs |
US7894159B2 (en) | 2007-04-19 | 2011-02-22 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular write head with independent trailing shield designs |
US8015692B1 (en) | 2007-11-07 | 2011-09-13 | Western Digital (Fremont), Llc | Method for providing a perpendicular magnetic recording (PMR) head |
US20090122449A1 (en) * | 2007-11-08 | 2009-05-14 | Samsung Electronics Co., Ltd. | Magnetic write head and method of manufacturing the same |
US8233236B2 (en) * | 2007-11-08 | 2012-07-31 | Seagate Technology International | Magnetic write head with side shield and gap layer |
US20090152235A1 (en) * | 2007-12-13 | 2009-06-18 | Wen-Chien David Hsiao | Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control |
US8000064B2 (en) | 2007-12-13 | 2011-08-16 | Tdk Corporation | Thin-film magnetic head for perpendicular magnetic recording and method of making the same |
US7990651B2 (en) | 2007-12-13 | 2011-08-02 | Hitachi Global Storage Technologies Netherlands B.V. | Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control |
US8793866B1 (en) | 2007-12-19 | 2014-08-05 | Western Digital (Fremont), Llc | Method for providing a perpendicular magnetic recording head |
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US20050083605A1 (en) | 2005-04-21 |
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